OK, this is my final answer: In 5% of the populace (since recorded history), there is an innate spiritual longing for a God.
That is, 5% of us are willing to try to prove the existence of God that we feel in us and around us to the remaining 95% who view God as a somewhat of a constraint upon their natural proclivities but who will, nonetheless, internalize the premise of said God for psycho-socio-emotional reasons.
Put another way, a large chunk of humanity is happy to cloak themselves in the lovelier aesthetics of their religion but few are impassioned enough to explore, quantify and prove the existence of their God.
Am I getting close to what you're looking for, yet?